Parameter Huawei

GSM900

DCS1800

GSM900 GSM900

DCS1800 DCS1800

2G Connected Mode (Handover Control) CS RACH Min. Access Level -106

Layer of The Cell 3

Edge HO UL RX_LEV Threshold 12

Edge HO DL RX_LEV Threshold 15

Inter-layer HO Threshold 25

Inter-layer HO Hysteresis 2

Min UL Level on Candidate Cell 10

Min DL Level on Candidate Cell 15

Min Power Level For Directed Retry 25

Inter-cell HO Hysteresis 68

Min Access Level Offset 0

PBGT HO Threshold 68

BQ HO Margin 69

Adjacent Cell Inter-layer HO Hysteresis 67

CS RACH Min. Access Level -106

Layer of The Cell 2

Edge HO UL RX_LEV Threshold 12

Edge HO DL RX_LEV Threshold 15

Inter-layer HO Threshold 25

Inter-layer HO Hysteresis 2

Min UL Level on Candidate Cell 10

Min DL Level on Candidate Cell 15

Min Power Level For Directed Retry 25

Inter-cell HO Hysteresis 68

Min Access Level Offset 0

PBGT HO Threshold 68

BQ HO Margin 69

Adjacent Cell Inter-layer HO Hysteresis 67

Edge HO UL RX_LEV Threshold

Edge HO DL RX_LEV Threshold

TA Handover

Bad Quality HO

Load Handover

Filtered downlink RX level of the target cell ≥

Inter-layer HO Threshold + Adjacent Cell Inter-

layer HO Hysteresis - 64

Macro Layer

Micro Layer

GSM900

DCS1800

2G&3G Cell Selection & Reselection

WCDMA

GSM900

Minimum Access RXLEV -102

MS_TXPWR_MAX_CCH 33 (5)

CBQ (Cell Bar Qualify ) No

CBA (Cell Bar Access ) No

CRO (Cell Reselection Offset) 0

TO (Temporary Offset) 0

PT (Penalty Time) 0

CRH (Cell Reselection Hysteresis) 6 db.

Qsearch I 7

Qsearch C Initial Use_Qsearch_I

FDD Q Offset 0

FDD RSCP Min. 6

FDD REP QUANT EcN0

FDD Multirate Reporting 2

FDD Qmin 5

FDD Qmin Offset 0

Qsearch P 7

Qsearch C 15

WCDMA

Cell Sel-reselection quality measure CPICH_ECNO

Hysteresis 1 for idle mode 2

Hysteresis 1 for connect mode 2

Hysteresis 2 for idle mode 1

Hysteresis 2 for connect mode 1

Reselection delay time 1

Min quality level -18

Min Rx level -58

Min Rx level Extend Support FALSE

Delta Min Rx level -

Max allowed UE UL TX power 24

Intra-freq cell reselection threshold for idle mode 5

Inter-freq cell reselection threshold for idle mode 4

Intra-freq cell reselection threshold for connect mode 5

Inter-freq cell reselection threshold for connect mode 4

Inter-RAT cell reselection threshold 2

Absolute priority level of the serving cell 4

RSCP threshold for low-prio-freq measurement initiation 2

Ec/No threshold for low-prio-freq measurement initiation 2

RSCP threshold for low-prio-freq reselection 1

DCS1800

Minimum Access RXLEV -102

MS_TXPWR_MAX_CCH 30 (0)

CBQ (Cell Bar Qualify ) No

CBA (Cell Bar Access ) No

CRO (Cell Reselection Offset) 8

TO (Temporary Offset) 0

PT (Penalty Time) 0

CRH (Cell Reselection Hysteresis) 6 db.

Qsearch I 7

Qsearch C Initial Use_Qsearch_I

FDD Q Offset 0

FDD RSCP Min. 6

FDD REP QUANT EcN0

FDD Multirate Reporting 2

FDD Qmin 5

FDD Qmin Offset 0

Qsearch P 7

Qsearch C 15

GSM

Inter-RAT & Inter-Frequency Handover

WCDMA F1

WCDMA F2

Inter-RAT CS Measure Start Ec/No THD -14

Inter-RAT CS Measure Stop Ec/No THD -11

Inter-RAT R99 PS Measure Start Ec/No THD -15

Inter-RAT R99 PS Measure Stop Ec/No THD -13

Inter-RAT HSPA Measure Start Ec/No THD -15

Inter-RAT HSPA Measure Stop Ec/No THD -13

Inter-RAT CS Measure Start RSCP THD -100

Inter-RAT CS Measure Stop RSCP THD -97

Inter-RAT R99 PS Measure Start RSCP THD -110

Inter-RAT R99 PS Measure Stop RSCP THD -107

Inter-RAT HSPA Measure Start RSCP THD -110

Inter-RAT HSPA Measure Stop RSCP THD -107

Inter-freq CS Measure Start Ec/No THD -14

Inter-freq CS Measure Stop Ec/No THD -12

Inter-freq R99 PS Measure Start Ec/No THD -14

Inter-freq R99 PS Measure Stop Ec/No THD -12

Inter-freq H Measure Start Ec/No THD -14

Inter-freq H Measure Stop Ec/No THD -12

Inter-freq CS Measure Start RSCP THD -95

Inter-freq CS Measure Stop RSCP THD -92

Inter-freq R99 PS Measure Start RSCP THD -95

Inter-freq R99 PS Measure Stop RSCP THD -92

Inter-freq H Measure Start RSCP THD -95

Inter-freq H Measure Stop RSCP THD -92

Inter-freq CS Target Frequency Trigger Ec/No THD -12

Inter-freq R99 PS Target Frequency Trigger Ec/No THD -12

Inter-freq HSPA Target Frequency Trigger Ec/No THD -12

Inter-freq CS Target Freqency Trigger RSCP THD -92

Inter-freq R99 PS Target Frequency Trigger RSCP THD -92

Inter-freq HSPA Target Freqency Trigger RSCP THD -92

Inter-freq CS Used frequency trigger Ec/No THD -12

Inter-freq R99 PS Used frequency trigger Ec/No THD -12

Inter-freq H Used frequency trigger Ec/No THD -12

Inter-freq CS Used frequency trigger RSCP THD -92

Inter-freq R99 PS Used frequency trigger RSCP THD -92

Inter-freq H Used frequency trigger RSCP THD -92

Inter-freq Handover Min Access Ec/No THD -16

Inter-freq Handover Min Access RSCP THD -115

CS RACH Min. Access Level Meaning: This parameter specifies the level threshold for the random access of the MS. If the receive level of

the RACH burst in the CS domain is smaller than the value of CS RACH Min.Access Level, the BTS regards

this access as an invalid one and no decoding is performed. If the receive level of the RACH burst is greater

than the value of CS RACH Min. Access Level, the BTS considers that an access request exists on this

timeslot, and determines together with the value of Random Access Error Threshold whether the RACH

access is valid.

GUI Value Range: -121~-104

Unit: dBm

Actual Value Range: -121~-104

MML Default Value: None

Recommended Value: -109

Parameter Relationship: The value of this parameter must be smaller than RACH Busy Threshold in the

SET GCELLCCBASIC command.

Service Interrupted After Modification : No (No impact on the UE in idle mode)

Impact on Network Performance: If this parameter is set to a greater value, the call drop rate decreases but

the traffic volume and paging success rate are affected.

http://localhost:7891/pages/31184923/14/31184923/14/resources/mbsc/m-mml/set-gcellccbasic.html

Layer of The Cell A network basically consists of four layers, namely, Umbrella, Macro, Micro, and Pico. Cell priorities

influence the sorting of neighboring cells during handovers as well as handover algorithms including PBGT

and inter-layer handovers. For example, PBGT handovers can only occur among cells on a same layer and of

a same priority level. If you assign different layers and priorities to a 1800-M cell and a 900-M cell, PBGT

handovers from the 1800-M cell to the 900-M cell will not occur. This causes slow handovers even when the

receive quality is good.

There are four network layers, that is, layer 1 to layer 4. A lower layer No. indicates a higher priority. The

cell priority is determined by both the network layer and the "PRIOR" parameter.

Edge HO Meaning: Whether to enable the edge handover algorithm. When an MS makes a call at the edge of a cell, the

call may drop if the received signal level is too low. To avoid such a call drop, the edge handover algorithm is

involved. When the uplink signal level of the serving cell is less than "Edge HO UL RX_LEV Threshold" or

the downlink signal level of the serving cell is less than "Edge HO DL RX_LEV Threshold", the edge

handover is triggered.

GUI Value Range: NO(No), YES(Yes)

Actual Value Range: NO, YES

Default Value: YES

Unit: None

Inter-layer HO Threshold & Inter-layer HO Hysteresis

Handover threshold during the handovers between cells on different layers or of different priorities. This

value is used to suppress inter-layer ping-pong handovers. Inter-layer handover threshold of the serving cell

= "Inter-layer HO threshold" - "Inter-layer HO Hysteresis"; Inter-layer handover threshold of a neighboring

cell = "Inter-layer HO Threshold" + "Adjacent Cell Inter-layer HO Hysteresis" - 64.

Set this parameter properly to ensure that hierarchical handover and load-based handover can function

properly. During hierarchical handover and load-based handover, the downlink received level of the target

cell must be greater than this threshold.

Min UL/DL Level on Candidate Cell Meaning: Limit on the minimum uplink receive level for a neighboring cell. You are advised to use the

default value 0 for this parameter because the receive level for a neighboring cell can be limited by Min DL

Level on Candidate Cell. The uplink receive level for a neighboring cell cannot be obtained from a live

network. It is estimated using the following formula:

Uplink receive level for a neighboring cell = Maximum transmit power of an MS - (BTS transmit power -

Downlink receive level for a neighboring cell).

GUI Value Range: 0~63

Unit: dB

Actual Value Range: 0~63


Recommended Value: 0

Parameter Relationship: None


Impact on Network Performance: You are advised to use the default value 0 for this parameter.

Meaning: If the downlink received signal level of a neighbor cell is greater than Min DL Level on Candidate

Cell plus Min Access Level Offset, the neighbor cell can be listed in the candidate cell queue for handover.


Unit: dB




Parameter Relationship: None


Impact on Network Performance: This parameter limits the number of candidate cells. If this parameter is set

to a greater value, some desired cells may be excluded from the candidate cells and call drops may occur. If

this parameter is set to a smaller value, an unwanted cell may become the candidate cell, thus leading to

handover failures or call drops.

Min Power Level For Directed Retry

Meaning: In a direct retry, when the receive level of a neighboring cell is no smaller than this parameter, the

neighboring cell can be a candidate cell for the direct retry. The parameter is invalid in handover algorithm II.


Unit: dB




Parameter Relationship: This parameter is valid only when HOCTRLSWITCH is set to HOALGORITHM1.


Impact on Network Performance: None

Inter-cell HO Hysteresis

Hysteresis value during the handovers between cells, This value is used to suppress ping-pong handovers

between cells. The actual value of this parameter is equal to the GUI value minus 64

When "Current HO Control Algorithm" in "SET GCELLHOBASIC" is set to HOALGORITHM1(Handover

algorithm I), "Inter-cell HO Hysteresis" should be set within the range of 64-127.When "Current HO Control

Algorithm" in "SET GCELLHOBASIC" is set to HOALGORITHM2(Handover algorithm II), "Inter-cell HO

Hysteresis" should be set within the range of 0-127.

Min Access Level Offset

Minimum receive level offset. MSs can be handed over back to a neighboring cell when both of the

following conditions are met: Downlink receive level of the neighboring cell >= Value of

"HOCDCMINDWPWR" + Value of this parameter Uplink receive level of the neighboring cell >= Value of

"HOCDCMINUPPWR" + Value of this parameter

This parameter is based on "HOCDCMINDWPWR" and "HOCDCMINUPPWR". Different offset can be set

for different neighboring cells. The following condition must be met for a neighboring cell to be added into

the candidate cell queue: Neighboring cell uplink level >= ("HOCDCMINUPPWR" + "MINOFFSET");

Neighboring cell downlink level >= ("HOCDCMINDWPWR" + "MINOFFSET").

PBGT HO Threshold

PBGT handovers to a neighboring cell are allowed only when the downlink level difference between the

neighboring cell and the serving cell is larger than this parameter. When the value of this parameter is smaller

than 64, handovers to a neighboring cell with a lower level than the current serving cell are allowed. The

actual value of this parameter is equal to the GUI value minus 64.

In densely populated urban areas, the recommended value is 68; in the suburbs, the recommended value is 72

BQ HO Margin

Difference between the downlink receive level of the serving cell and that of a neighboring cell during bad

quality handovers. This parameter is used to calculate the bad quality handover hysteresis based on the

following formula: Bad quality handover hysteresis = Value of "INTERCELLHYST" -Value of this

parameter Bad quality handovers to a neighboring cell can be triggered when the following condition is met:

(Downlink receive level of the neighboring cell after filtering - Downlink receive level of the serving cell

after power control compensation) > (Value of "INTERCELLHYST " - 64) - (Value of this parameter - 64).

The actual value of this parameter is equal to the GUI value minus 64

This parameter is used with "INTERCELLHYST" to calculate the bad quality handover hysteresis

Adjacent Cell Inter-layer HO Hysteresis

Hysteresis value during the handovers between cells on different layers or of different priorities. This value is

used to suppress inter-layer Ping-Pong handovers. The actual value of this parameter is equal to the GUI

value minus 64

Inter-layer HO threshold of the serving cell = "Inter-layer HO threshold" - "Inter-layer HO Hysteresis". Inter-

layer HO threshold of the neighboring cell = "Inter-layer HO threshold" + "Adjacent Cell Inter-layer HO

Hysteresis" - 64. The value of "Inter-layer HO threshold" can be set through "SET GCELLHOBASIC"

TA Handover

This parameter specifies the actual coverage area of a cell.

After receiving the channel request message or handover access message, the BTS determines whether the

channel assignment or handover is performed in the cell by comparing the TA and the value of this

parameter.

The value of this parameter correlates with Cell ExtType. If this parameter is set to a too small value, the

handover success rate may be affected

Bad Quality Handover

Whether to enable the bad quality (BQ) handover algorithm. Whether to trigger BQ handover depends on the

uplink and downlink transmit quality (measured by using BER). If the uplink or downlink BQ exceeds the

BQ handover threshold, emergency BQ handover is triggered. The possible causes of BER increase (or

quality degradation) include too low signal power and channel interference.

Load Handover Huawei 2G Load HO feature:

Load HO Allowed: This parameter is for traffic sharing between cells, if it adjusted “Yes” then it is enabled, if

“No” then it is disabled.

Load HO Bandwidth: The setting of this parameter depends on Edge HO DL Rx_Lev threshold parameter.

Load HO can be performed, only receive signal level of the serving cell is between this threshold (Edge HO DL

Rx_Lev; Edge HO DL Rx_Lev + Load HO Bandwidth). The value of this parameter ranges from 0 to 63

(corresponding to -110 dbm to -47 dbm).

Load HO Threshold: Load HO is triggered when the occupation of TCHs in the serving cell reaches to this

threshold. Threshold is 0 % - 100 %, default value is 85 %.

Load Req. on Candidate Cell: If the cell load is smaller than this value then the serving cell will receive MSs

handed over from other cells, otherwise MSs handed over will be rejected. Threshold is 0 % - 100 %, default

value is 75 %.

Load HO Step Period: If the cell load of the serving cell is equal or more than Load HO Threshold, then all

MSs between defined bandwidth try to load HO. That is why for not overloading Central Processing Unit

(CPU) of the BSC boards Huawei uses Load HO Step Period. Load HO performs according to this period with

consecutively not all MSs at the same time. If it is set to a too greater value, the handover time of each level is

long. Default value is 10 seconds.

Load HO Step Level: Load handover may lead to many handovers. Therefore, the load of the system CPU

should be considered before load handover is performed. In other words, the system traffic volume should be

taken into account. In addition, to prevent too many MSs from being handed over at a time, load handover is

performed step by step. In other words, the edge handover threshold is increased on the basis of Load HO Step

Level (CLS_Ramp) and Load HO Step Period (CLS_Period).

When the increase in the edge handover threshold equals Load HO Bandwidth (CLS_Offset), the edge

handover threshold is not increased any more.

Edge HO DL RxLev Thres. (-95db) Edge HO DL RxLev Thres. + Load HO Bandwidth (-70db)

-95db -70db

Load HO Step Level

Load HO Step Period (5 sec.)

Load HO Bandwidth

Load HO can be performed if the load of the serving cell is reached to Load HO threshold

Minimum Access RXLEV

Minimum received signal level of the MS. This level is reported in the system information. This parameter

specifies the minimum receive level of an MS to access the BSS. For details. see GSM Rec. 05.08. The value

of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm)

If the value of this parameter is too small, the required level of received signals is low. Therefore, many MSs

attempt to camp on the cell, thus increasing the load of the cell and the risk of call drops. In such a case, you

must set the parameter based on the balance conditions of the uplink and downlink levels

MS_TXPWR_MAX_CCH

Maximum transmit power level of MSs. As one of the cell reselection parameters in system message 3, this

parameter is used to control the transmit power of MSs. For details, see GSM Rec. 05.05. In a GSM900 cell,

the maximum power control level of an MS ranges from 0 to 19, corresponding respectively to the following

values (unit: dBm): 43, 41, 39, 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, 15, 13, 11, 9, 7, and 5.Generally, the

maximum transmit power supported by an MS is level 5 (corresponding to 33 dBm). The minimum transmit

power supported by an MS is level 19 (corresponding to 5 dBm). Other transmit power levels are reserved

for high-power MSs. In a GSM1800 or GSM1900 cell, the maximum power control level of an MS ranges

from 0 to 31, corresponding respectively to the following values (unit: dBm): 30, 28, 26, 24, 22, 20, 18, 16,

14, 12, 10, 8, 6, 4, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 34, and 32. Generally, the maximum transmit

power supported by an MS is level 0 (corresponding to 30 dBm). The minimum transmit power supported by

an MS is level 15 (corresponding to 0 dBm). Other transmit power levels are reserved for high-power MSs

The default value of "MS_TXPWR_MAX_CCH" in the GSM900 and GSM850 cells is 5; the default value

of "MS_TXPWR_MAX_CCH" in the DCS1800 and PCS1900 cells is 0

Cell Bar Qualify

Used together with "Cell Bar Access" to decide the priority status of a cell. See GSM Rec. 0408. This

parameter does not affect cell reselection but cell selection only. Cell Bar Qualify Cell Bar Access Cell

selection priority Cell reselection priority NO NO Normal Normal NO YES Prohibited Prohibited YES NO

Low Normal YES YES Low Normal

If the value of "Cell Bar Access" is YES and the value of "Cell Bar Qualify" is NO, new call access is

prohibited but handover access is allowed

Cell Bar Access

Used together with "Cell Bar Qualify" to decide the priority status of a cell. Refer to GSM Rec. 04.08. Cell

Bar Qualify Cell Bar Access Cell selection priority Cell reselection priority NO NO Normal Normal NO

YES Prohibited Prohibited YES NO Low Normal YES YES Low Normal

The CBA function applies to special scenarios. If this parameter is set to YES and "Cell Bar Qualify" is set to

no, only handovers are allowed in a cell, and direct access of an MS is not allowed. This condition applies to

a dual-network coverage cell. For a common cell, this parameter should be set to NO.

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Parameter Huawei